Analysing the form of the confined uniaxial compression curve of various soils

The soil compaction by vehicles is a major factor responsible for physical degradation of cultivated soils. Uniaxial confined compression tests are usually performed to characterise the compaction properties of soil. Two main forms of compression curve have been observed: (i) the bi-linear curve hav...

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Bibliographic Details
Published in:Geoderma 2009-01, Vol.148 (3), p.282-290
Main Authors: Tang, Anh-Minh, Cui, Yu-Jun, Eslami, Javad, Défossez, Pauline
Format: Article
Language:English
Subjects:
Agricultural soil
Agronomy. Soil science and plant productions
Biological and medical sciences
Bulk density
Compression curve
Compression index
Confined uniaxial compression test
Earth sciences
Earth, ocean, space
Engineering Sciences
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Mechanics
Mechanics of materials
Physics
Soils
Surficial geology
Water content
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Summary:The soil compaction by vehicles is a major factor responsible for physical degradation of cultivated soils. Uniaxial confined compression tests are usually performed to characterise the compaction properties of soil. Two main forms of compression curve have been observed: (i) the bi-linear curve having an elastic rebound curve at low stresses and a linear virgin compression curve at higher stresses; (ii) the S-shaped curve having deviation of the virgin compression curve at high stresses. In the present work, uniaxial confined compression tests were performed on four soils having various textures and different plasticity. Tests were performed on undisturbed and remould samples, at various initial dry bulk densities and water contents. The S-shaped compression curves were observed more frequently when the clay content and/or the initial water content were high. In addition, the S-shaped curves were observed more frequently on remould soils than on undisturbed soils. The difference between the compression of air-filled pores and that of meso-pores storing water subjected to high capillary forces could explain the observed S-shaped curves.
ISSN:0016-7061
1872-6259
DOI:10.1016/j.geoderma.2008.10.012